TY  - BOOK
AU  - Lanczos, Cornelius.,
TI  - Variational principles of mechanics
T2  - Mathematical expositions ; no. 4
SN  - 9780486650678
U1  - 531.01517  LAN 
PY  - 1970///
CY  - Toronto
PB  - University of Toronto Press
N1  - Bibliography
ER  -